Machine-awl.



W. P. LEWIS.

MACHINE AWL.

APPLICATION FILED Anna, 1911.

Patented Apr. 30, 1912.

WITNESSES- INVENTOR.

- ATTORNEY.

WILLIAM F. LEWIS, OF LYNN, MASSACHUSETTS.

MACHINE-AWL.

Specification of Letters Patent.

Application filed April 3, 1911.

Serial No. 618,609.

To all whom it may concern:

Be it lmown that I, WVILLIAM F. LEWIS, a citizen of the United States ofAmerica, residing at Lynn, in the county of Essex and Commonwealth ofMassachusetts, have invented a new and useful Improvement inMachine-Awls, of which I do declare the following to be such a full,clear, and exact description as will enable others versed in the art towhich it appertains to make and use my said invention, reference beinghad to the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification, in explaining itsnature.

Similar letters of reference refer to similar parts throughout thevarious views.

My invention relates to knife edged awls designed for use institchingmachines and more particularly in what is known as the Goodyear rapidstitcher, used extensively by shoe workers in sewing shoe soles onGoodyear welts, and has for its objects, 1st, to provide a means ofsufliciently perforating the article to be stitched by a smaller size.awl than has heretofore been used, thereby insuring a smaller cut orslit in the article stitched. 2nd, to provide a means of making aperforation, slit shape in form yet provided with a right angled recessin which the lock stitch of the thread may tightly fit, and thus beassured of thread adhesion long after the exposed surface of thethreads, have been worn away. 3rd, to thereby improve the appearance ofthe completed stitch, and to secure other advan tages and results someof which may be referred to hereinafter in connection with thedescription of the various parts. I attain these objects as shown in theaccompanying drawings, in which,

Figure 1, shows my improved awl from all four sides. Fig. 2, shows thedetail end of my awl on an angle just between G and D in Fig. 1. Fig. 3,shows the relative position of my awl to the needle which follows it upin the Goodyear rapid stitcher. Fig. 4, shows a section of a sole inwhich perforations have been made by my improved awl.

In Fig. 1, A, B, G and D show my awl from its four sides. The awl iscurved in form and has a knife edge at its sharp end E. Toward the lowerend, the awl is peculiarly formed or shaped, so as to form a tooth F;that is to say, the lower end is provided with two longitudinal notchesor grooves f, f, separated by the tooth F, which is slightly removedfrom the lower end of the awl. The tooth F saws into the material whichthe awl enters and creates therein a roughened furrow at rightangles tothe cut made by the knife edge of the awl, in which roughened furrow thelock stitch of the thread used becomes firmly embedded. The addition ofthe roughened furrow makes it unnecessary to have as large a cuttingedge on the awl as is ordinarily required to let the needle and threadthrough, and thus I am enabled to use a smaller sized awl. All this addsthe decided advantage of creating in the finished stitch a tight fittingthread which as I have above stated adds to its adhesiveness andincreases the life of the shoe. To those inexperienced in the art towhich my said invention relates it might seem evident that the sameresults would be obtained by using a round awl, but experience hasdemonstrated that in the use of a machine awl it is absolutely essentialto insure the best results to have an awl provided with a knife edge andformed as I have described. It is by the addition of the auxiliary tooththat I obtain the stated results.

In Fig. 8, G shows the needle which follows the awl through the sole Hof the shoe. J represents a loop of thread which engages in the hook Kof the needle G when said needle has passed through the sole H.

Having thus described my invention, what I claim as new is A machine-awlprovided, at its lower end, with a knife edge, with two longitudinalnotches adjacent said lower end, and with a tooth separating saidnotches; substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand in the presence of twoattesting witnesses.

WILLIAM F. LEWIS. Witnesses:

CHARLES W. Lovnr'r, HAROLD A. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

Patented Apr. 30, 1912.

